Which of the following best describes absorption of a wave? a. as a wave reaches the interface between two different media, its direction of motion changes, and it remains in the first medium. b. as a wave moves from one medium into another in which its speed is different, the wave changes direction. c. as a wave moves from one medium to another, the energy of the wave is converted to other forms of energy. d. as a wave moves around a corner or through an opening, its direction of motion changes.